Calculate the heat of reaction for combustion of C2H5OH using bond energies
1. Calculate the heat of reaction for combustion of C2H5OH using bond energies
Reaction C₂H₅OH + 3O₂ --> 2CO₂ + 3H₂O
Then draw the structural formulas for each molecule showing single and double bonds.
C₂H₅OH has one C-C bond, five C-H bonds, one C-O bond and one O-H bond
add up the bond energies for a mole of each of these single bonds from your bond energy chart.
Now in O₂ we have O=O double bond so add up the total bond energy for three moles of O₂. (three times the doubly bonded oxygen bond energy)
CO₂ is formed O=C=O, and you have two moles of CO₂, and four moles of C=O bonds so multiply the C=O bond energy by 4
and for H₂O, bonded H-O-H you will have 6 moles of H-O bonds, so multiply the H-O bond energy by six.
Now to get ΔH for this reaction, simply subtract the sum of the reactant bond energies from the sum of the product bond energies and you have it.
2. Apply the aims of a diary, and choose which one of these notes best represents the characteristics of a diary.
Terjemahan
Inggris - Indonesia
Inggris :
Apply the aims of a diary, and choose which one of these notes best represents the characteristics of a diary.
Indonesia :
Terapkan tujuan buku harian, dan pilihlah buku harian mana.
3. ________ are numbers that represents the products of consecutive positive integers.
Jawabannya: zero (nol)
Pesan: maaf kalau salah, semoga membantu
4. 28. Which does NOT change with time for a first-order reaction? (A) the amount of reactant that disappears in each half- life (B) the concentration of the reactant (C) the length of each half-life (D) the rate of the reaction
Pada reaksi order pertama yang tidak mengalami perubahan adalah :
C. The length of each half-life
Pembahasan
Reaksi orde pertama adalah reaksi dalam orde menetap, laju reaksi berbanding lurus dengan konsentrasi salah satu reaktan. Reaksi orde pertama sering memiliki bentuk umum A → produk. Tingkat diferensial untuk reaksi orde pertama adalah sebagai berikut:
laju=−Δ[A]/Δt=k[A]
Jika konsentrasi A digandakan, laju reaksi menjadi dua kali lipat, jika konsentrasi A dinaikkan dengan faktor 10, laju reaksi meningkat dengan faktor 10, dan seterusnya. Karena satuan laju reaksi selalu mol per liter per detik, satuan konstanta laju orde pertama adalah detik timbal balik (s−1). Hukum laju terintegrasi untuk reaksi orde pertama dapat ditulis dalam dua cara yang berbeda: satu menggunakan eksponen dan satu menggunakan logaritma. Ingat bahwa hukum laju terintegrasi memberikan hubungan antara konsentrasi reaktan dan waktu.
Pelajari lebih lanjut
Pelajari lebih lanjut mengenai materi laju reaksi orde pertama pada link berikut :
https://brainly.co.id/tugas/6386928
#BelajarBersamaBrainly
#SPJ1
5. 1. Choose your favorite song about humanity, then write the lyric! 2. Give the meaning of the song that you choose! 3. Find the moral value of the song you choose!
Jawaban:
1. Imagine - John Lennon
Imagine there's no heaven
it's easy if you try
No hell below us
Above us only sky
Imagine all the people living for today
Imagine there's no countries
It isn't hard to do
Nothing to kill or die for
And no religion too
Imagine all the people living life in peace, you
You may say I'm a dreamer
But I'm not the only one
I hope some day you'll join us
And the world will be as one
Imagine no possessions
I wonder if you can
No need for greed or hunger
A brotherhood of man
Imagine all the people sharing all the world, you
You may say I'm a dreamer
But I'm not the only one
I hope some day you'll join us
And the world will be as one
2.Through these lyrics, John Lennon was asking us to imagine a place where things that divide people did not exist. The song covers the violence issue we have in this world. We are surrounded by hate, cruelty, murder, war and racism. The world that he sings about tells us how we should want the world to be
3.To build a one world together as one without discriminate anything.
6. choose the letter of the underlined word that is not correct... di gambar
1. c
2. b
3. a
4. d
5. a
6. b
7. d
8. b
9. b
10. c
maaf kalau ada yang salah
7. the combustion reaction of 12.0 mg of a monocarboxylic acid, which contains only carbon, hydrogen and oxygen, gave 17,6 mg of CO2 and 7,20 mg of H2O. the compositional formula of the compound is ??
CxHyOz + O₂ ⇒ CO₂ + H₂O
massa C dalam CO₂
[tex]C= \frac{Ar.C}{Mr.CO_{2} }.massa CO_{2} \\ = \frac{12}{44}.17,6 \\ =4,8mg [/tex]
massa H dalam H₂O
[tex]H= \frac{2.Ar.H}{Mr.H_{2}O }.massa H_{2}O \\ = \frac{2}{18}.7,2 \\ =0,8mg [/tex]
kan monocarboxylic acid nya 12 mg
massa C + massa H + massa O = 12
4,8 + 0,8 + massa O = 12
massa O = 6,4 mg
perbandingan
C : H : O
massa C/Ar C : massa H/Ar H : massa O/Ar O
[tex] \frac{4,8}{12} : \frac{0,8}{1} : \frac{6,4}{16} \\ 0,4 : 0,8 : 0,4 \\ 1:2:1 [/tex]
compositional formulanya CH₂O
8. choose the sentences that show expression of asking help.( choose three expressions)
Jawaban:
- Can you help me?
- Could you please help me?
- Can you do me a favor, please?
Penjelasan:
Semoga membantu yaa
9. if the mass of the products of the reaction above was 45g,what was the mass of the reactants?
Jawaban:
karena itu bisa pakai mandiri
10. 4) Which of the following represents all the possible values of x that satisfy the equation below? X X x − 3 2x 2 *
Nilai x memenuhi persamaan yaitu x = 0 atau x = 4. Soal ini berkaitan dengan materi mencari nilai x dari suatu persamaan.
Penjelasan dengan langkah-langkahDiketahui :
Koreksi soal, mungkin maksud Anda persamaan x/(x-3) = 2x/2
Ditanyakan :
Solusi dari permasalahan tersebut
Jawab :
Langkah 1
x / (x - 3) = 2x / 2
Jika dipindah ruas akan menjadi :
x . 2 = 2x . (x – 3)
Selanjutnya kita lakukan operasi
2x = [tex]2x^{2}[/tex] – 6x
0 = [tex]2x^{2}[/tex] – 8x
0 = 2x (x – 4)
x = 0 atau x = 4
Jadi, x yang memenuhi adalah x = 0 atau x = 4
Pelajari Lebih LanjutMateri tentang mencari nilai x dari suatu persamaan brainly.co.id/tugas/26215307
#BelajarBersamaBrainly #SPJ1
11. Find or make one quote that represents the song lyrics of “Count on Me”!
Jawaban:
1. Friends are people who accept you as you are. People who are always willing to accept your complaints when there are problems and so on.
2. A true friend is someone who is always there with you, always helping you in a sad or happy situation.
12. Choose the letter of the word or group of words that best completes the sentence
The word group that completes the sentence the most is the conjunction. Conjunctions are words that are used to connect words with words, expressions with phrases, or sentences with sentences.
Pembahasan :
Konjungsi atau kata sambung adalah kata atau ungkapan yang menghubungkan dua satuan bahasa yang sederajat: kata dengan kata, frasa dengan frasa, klausa dengan klausa, serta kalimat dengan kalimat.
Selain menggabungkan beberapa kalimat, kata penghubung pun dapat memperkuat maksud yang ingin disampaikan oleh pembicara. Kata penghubung adalah kata tugas yang menghubungkan dua satuan bahasa yang sederajat: kata dengan kata, frasa dengan frasa, atau klausa dengan klausa.
Jenis kata sambung antara lain :
Kata Hubung Aditif. Kata Hubung Waktu. Kata Hubung Pertentangan. Kata Hubung Pilihan. Kata Hubung Tujuan. Kata Hubung Sebab. Kata Hubung Akibat.Pelajari lebih lanjut
Contoh kalimat dengan kata sambung
https://brainly.co.id/tugas/2653082
#BelajarBersamaBrainly#SPJ4
13. is combustion of Alkanes not a reversible reaction?
1.d
2.a
i'am sorry if i'am wrong
14. choose the letter of the underlined word that is not correct?.....di gambar
1. A Has
2. C Mays
3. B to go
4. A Have
5. C Go
6. B. Does
7. A. Finish
8. D Has
9. B Have
10. C Ate
15. choose the letter of the word of group of words that best completes the sentence .......Of the pueblo indians centered on intensive agriculture
Jawaban:
= The economic activity
16. There are 25 students performing in the holiday concert. Of the students, 11 are boys.What decimal represents the fraction of students that are boys?b. What percent represents the fraction of students that are boys?
A. 11/25 x 4/4 = 44/100
0.44
B.44/100 = 44%
Maaf kalau salah
:)
17. Choose the sentences below that is true about the characteristic of Suggestopedia
Jawaban:
Pilihlah kalimat di bawah ini yang benar tentang ciri-ciri sugestopedia
Penjelasan:
semoga bisa membantu
18. If A represents 256 units of stamps and B represents 168 units of stamps. The ratio of B to the total of stamps in the simplest form is
Jawab:
53 : 21
Penjelasan dengan langkah-langkah:
total= 256+168= 424
424 : 168
212 : 84
106 : 42
53 : 21
klo salah bilang di komen nanti saya coba perbaiki
19. Choose the letter of the underlined word of group of words that is not correct
Sorry .. i can't answer it .. plis write down
4. A
5. A
6. C
7. x
8. x
9. D
10. C
11. x
12. A
13. C
Next time, ask only one question at a time.
x = None? Sepertinya benar (In case of doubt, ask the teacher)
20. how is the reaction of photosynthesis?
Jawaban:
Photosynthesis occurs in two stages. In the first stage, light-dependent reactions or light reactions capture the energy of light and use it to make the energy-storage molecules ATP and NADPH. During the second stage, the light-independent reactions use these products to capture and reduce carbon dioxide.
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